Fix CI: use golangci-lint-action and update actions to latest

Replace unreliable curl install script with official golangci-lint-action.
Update checkout and setup-go to v4/v5 and use go-version-file.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: AchoArnold

.github/workflows/main.yml

@@ -10,34 +10,26 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup Go
-        uses: actions/setup-go@v2
-
-      - name: Setup Dependencies
-        run: |
-          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sudo sh -s -- -b $GOPATH/bin
-          golangci-lint --version
-          go get golang.org/x/tools/cmd/cover
-          go get -t -v ./...
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
 
       - name: Golang CI Lint
-        run: golangci-lint run
+        uses: golangci/golangci-lint-action@v6
 
   Test:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup Go
-        uses: actions/setup-go@v2
-
-      - name: Setup Dependencies
-        run: |
-          go get golang.org/x/tools/cmd/cover
-          go get -t -v ./...
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
 
       - name: Run Tests
         run: go test -v -race -coverprofile=coverage.txt -covermode=atomic